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FANNING OUT OF THE SOLAR f-MODE IN THE PRESENCE OF NON-UNIFORM MAGNETIC FIELDS?
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden .
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden .ORCID iD: 0000-0002-7304-021X
2014 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 795, no 1, L8- p.Article in journal (Refereed) Published
Abstract [en]

We show that in the presence of a magnetic field that is varying harmonically in space, the fundamental mode, or f-mode, in a stratified layer is altered in such a way that it fans out in the diagnostic k omega diagram, with mode power also within the fan. In our simulations, the surface is defined by a temperature and density jump in a piecewise isothermal layer. Unlike our previous work (Singh et al. 2014), where a uniform magnetic field was considered, here we employ a non-uniform magnetic field together with hydromagnetic turbulence at length scales much smaller than those of the magnetic field. The expansion of the f-mode is stronger for fields confined to the layer below the surface. In some of those cases, the k omega diagram also reveals a new class of low-frequency vertical stripes at multiples of twice the horizontal wavenumber of the background magnetic field. We argue that the study of the f-mode expansion might be a new and sensitive tool to determine subsurface magnetic fields with azimuthal or other horizontal periodicity.

Place, publisher, year, edition, pages
2014. Vol. 795, no 1, L8- p.
Keyword [en]
magnetohydrodynamics (MHD), Sun: helioseismology, turbulence, waves
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-158413DOI: 10.1088/2041-8205/795/1/L8ISI: 000345455500008Scopus ID: 2-s2.0-84908141066OAI: oai:DiVA.org:kth-158413DiVA: diva2:776362
Note

QC 20150107

Available from: 2015-01-07 Created: 2015-01-07 Last updated: 2017-12-05Bibliographically approved

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Brandenburg, Axel

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